CN218955833U - Range self-switching flowmeter - Google Patents
Range self-switching flowmeter Download PDFInfo
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- CN218955833U CN218955833U CN202223093675.4U CN202223093675U CN218955833U CN 218955833 U CN218955833 U CN 218955833U CN 202223093675 U CN202223093675 U CN 202223093675U CN 218955833 U CN218955833 U CN 218955833U
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Abstract
The utility model discloses a range self-switching flowmeter, which comprises a flow test module A, a flow test module B and a switching module; the flow test module A consists of a pipeline A and a throttle plate A, MEMS differential pressure sensor, the flow test module B consists of a pipeline B and a throttle plate B, MEMS differential pressure sensor, the switching module comprises a motor, a valve and a control circuit, and the control circuit selects a corresponding pipeline according to the flow real-time switching valve to realize fluid flow test. On the basis of meeting the requirements of a flow measurement range and a pressure loss index simultaneously, the flow measurement module channels are automatically switched by monitoring the fluid flow in real time, so that the accurate measurement of the fluid flow is realized. Compared with various existing flowmeters, under the same measurement precision grade requirement, the range self-switching flowmeter not only meets the pressure loss requirement, but also widens the working range of the flowmeter, so that the application field of the flowmeter is expanded.
Description
Technical field:
the utility model belongs to the technical field of flow measurement and microelectronic sensors, and relates to a range self-switching flowmeter.
The background technology is as follows:
flow measurement is an important parameter in industrial process measurement, and relates to a wide application field, and flow, temperature and pressure are recognized as three important parameters of thermal metering, and along with the development of industry and economy, flow metering technology and products are changed day by day. In particular, the development of sensor technology makes it possible to measure multiple parameters of a flowmeter and a meter, and the flowmeter can be divided into multiple types according to different principles and signal parameters, mainly including: float flow meter, volumetric flow meter, electromagnetic flow meter, ultrasonic flow meter, thermal mass flow meter, differential pressure flow meter, etc. The float flowmeter measures the fluid flow through the height of the float, and has simple structure and simple manufacture, but the application is limited by the single requirement on the fluid medium; the volumetric flowmeter is a meter for measuring the accumulated flow, has the advantages of high measurement precision and wide application, but has larger volume and is usually used for measuring cleaner single-phase fluid; the electromagnetic flowmeter performs flow measurement according to Faraday electromagnetic induction law, has the characteristics of small pressure loss, large measuring range and high precision, but is greatly influenced by application environment and is not suitable for fluid media with high temperature environment and low conductivity; the ultrasonic flowmeter measures the fluid flow by detecting the effect of fluid flow on ultrasonic pulses, has the characteristic of low pressure loss as well, but the high requirements on pipeline liners and fluid media limit the wide application of the flowmeter, so the ultrasonic flowmeter is mainly applied to flow measurement of large-caliber pipelines at present; the thermal flowmeter is a novel mass flowmeter, and the flow is measured through the change of a flow field to a temperature field, but the thermal flowmeter internally contains a heat source, so that the thermal flowmeter has the defect of high power consumption; the differential pressure type flowmeter is mainly characterized in that a throttling device is additionally arranged in the differential pressure type flowmeter to convert a fluid flow signal into a differential pressure signal, and compared with other types of flowmeters, the differential pressure type flowmeter is low in precision and mainly applied to industrial-grade medium-caliber and large-caliber flow tests.
In general, in order to adapt to various purposes, various existing flowmeters have diversity, and with development and application of new technologies, new devices and new materials, the requirements of the market on measurement precision, measurement range and application range of the flowmeter are higher and higher. The differential pressure flowmeter is widely used because of the advantages of simple structure, low cost, good stability and the like. The porous balance flowmeter overcomes the defects of indexes such as precision, pressure loss and the like on the basis of the traditional differential pressure flowmeter, but the flowmeter has the defect of low precision in a small flow test method. Therefore, the flow test in the full range cannot be satisfied, so that the application field is limited again and again.
The utility model comprises the following steps:
the utility model aims to provide a range self-switching flowmeter which automatically switches fluid flowing through a pipeline according to fluid flow in a low pressure loss range and has the characteristics of small pressure loss, wide range and low cost.
It is another object of the present utility model to provide such a range self-switching flow meter design and test method.
The technical solution of the utility model is as follows: a range self-switching flowmeter comprises a flow test module A, a flow test module B and a switching module; the flow test module A consists of a pipeline A and a throttle plate A, MEMS differential pressure sensor, the flow test module B consists of a pipeline B and a throttle plate B, MEMS differential pressure sensor, the MEMS differential pressure sensors are respectively arranged at the axle center positions of the throttle plate A and the throttle plate B and are used for sensing the pressure difference between the front and the rear of the throttle plate and converting the pressure difference signal into a flow signal, a plurality of function holes are respectively distributed on the throttle plate A and the throttle plate B and are distributed on the outer circumference taking the MEMS differential pressure sensor as the center, the number of the function holes is more than or equal to 2 according to the application environment requirement, the pressure difference is generated, and the influence caused by overlarge pressure loss is avoided; the switching module comprises a motor, a valve and a control circuit, and the control circuit selects a corresponding pipeline according to the flow real-time switching valve to realize the fluid flow test. The pipeline A and the pipeline B are independent of each other, and the sizes of the pipeline A and the pipeline B are configured in time according to the range of measurement; the throttle plate A is positioned inside the pipeline A; the throttle plate B is located inside the pipe B.
The utility model relates to a design and test method of a range self-switching flowmeter, which comprises the following specific steps:
step one: determining pressure loss and flow measurement range index requirements
According to the corresponding functional relation of differential pressure and flow, the measuring range self-switching flowmeter realizes real-time detection of fluid flow in the whole measuring range through automatic switching of two flow measuring modules with different specifications and sizes. The flow detection ranges corresponding to the two flow measurement modules are different, so that the corresponding structural parameters of the pipeline, the throttle plate and the function hole distribution of the throttle plate are different. Firstly, confirming the pipeline pressure loss and the flow measurement range according to the application requirements.
Step two: calculating structural parameters of pipeline, throttle plate and function hole
Comprehensively considering the index requirement of the pressure loss and the flow range, dividing the flow range into Q 1 、Q 2 ，Q 1 Corresponds to the flow range of small measuring range, Q 2 Corresponding to a wide range of flow rates, the total flow rate Q= { Q 1 、Q 2 }
Equation (1) is a corresponding functional relationship between fluid flow and pressure difference:
β＝d/D (2)
wherein Q is volume flow, C is outflow coefficient, epsilon is expansion coefficient, D is aperture of throttle plate function hole, D is diameter of pipeline, beta is equivalent diameter ratio, deltap is pressure difference, and ρ is fluid density.
Known flow rate Q 1 And pressure loss, and calculating the pipe diameter D of the pipeline A by combining the pressure loss (1) and the pressure loss (2) 1 The structural parameters of the function holes of the throttle plate comprise the number n of the function holes 1 Pore diameter d 1 ；
Known flow rate Q 2 And pressure loss, and calculating the pipe diameter D of the pipeline B by combining the pressure loss (1) and the pressure loss (2) 2 The structural parameters of the function holes of the throttle plate comprise the number n of the function holes 2 Pore diameter d 2 ；
The function holes are distributed on the same or different circumferences of the throttle plate and can be adjusted according to the specific application requirements.
Step three: simulation analysis of correspondence between fluid flow and pressure difference of two pipelines
And modeling by adopting Solidworks, then performing simulation analysis by using Ansys software Fluent modules, and judging whether the resolution of the MEMS differential pressure sensor is met according to a pressure difference curve when fluid flows through two different flow measurement modules, wherein the pressure difference corresponds to the front-back pressure difference of a throttle plate A and a throttle plate B in a pipeline. If not, adjust pipe diameter D 1 Or D 2 Function aperture d 1 Or d 2 Until the index requirement is met.
Step four: range self-switching flowmeter test verification
And (3) completing the design of the flow measurement module A and the flow measurement module B according to the steps one to three, and then connecting the flow measurement module A and the flow measurement module B with the switching module to form a closed loop test system. When the flow rate Q of the fluid is less than or equal to Q 1 When the switching control program sends out instructions to enable the main pipeline to be communicated with the pipeline A through the motor control valve, fluid in the pipeline flows through the flow measuring module A, and when the fluid flow Q 1 ＜Q≤Q 2 When the closed-loop testing system is adopted, the accurate measurement of the fluid flow in the whole range can be realized.
Step five: method performance evaluation
The method is influenced by experimental environmental factors, the actual test result and the theoretical simulation analysis result may have differences, the environmental factors are comprehensively considered in combination, the theoretical model is corrected, the internal structural parameters of the flow measurement module A and the flow measurement module B are optimized, and the test precision of the flowmeter is improved on the basis of meeting the test requirements.
Compared with the prior art, the utility model has the advantages that:
the range self-switching flowmeter of the utility model can realize accurate measurement of fluid flow by automatically switching the channels of the flow measurement module through monitoring the fluid flow in real time on the basis of meeting the requirements of the flow measurement range and the pressure loss index. Compared with various existing flowmeters, under the same measurement precision grade requirement, the range self-switching flowmeter not only meets the pressure loss requirement, but also widens the working range of the flowmeter, so that the application field of the flowmeter is expanded.
Drawings
FIG. 1 (a) is a top view of the structure of the self-switching range flowmeter of the present utility model;
FIG. 1 (b) is a cross-sectional view of A-A of the self-switching range flowmeter of the present utility model;
fig. 2 is a schematic structural diagram of a switching module of the range self-switching flowmeter of the present utility model.
In the figure:
the device comprises a 1-flow testing module A, a 2-flow testing module B, a 3-switching module, a 4-pipeline A, a 5-throttle plate A, a 6-MEMS differential pressure sensor, a 7-pipeline B, a 8-throttle plate B, a 9-function hole A, a 10-function hole B, a 11-motor, a 12-valve and a 13-control circuit.
Detailed Description
Fig. 1 is a schematic diagram of a range self-switching flowmeter. The device comprises a flow test module A-1, a flow test module B-2 and a switching module 3; the flow test module A-1 consists of a pipeline A-4, a throttle plate A-5 and an MEMS differential pressure sensor 6, the flow test module B-2 consists of a pipeline B-7, a throttle plate B-8 and the MEMS differential pressure sensor 6, and the MEMS differential pressure sensor 6 is respectively arranged at the axle center positions of the throttle plate A-5 and the throttle plate B-8 and is used for sensing the pressure difference between the throttle plate A-5 and the throttle plate B-8 and converting the pressure difference signal into a flow signal, a plurality of function holes A-9 are distributed on the throttle plate A-5, and a plurality of function holes B-10 are distributed on the throttle plate B-8, so that the pressure difference is generated and the influence caused by overlarge pressure loss is avoided; the switching module 3 comprises a motor 11, a valve 12 and a control circuit 13, wherein the control circuit 13 switches the valve 12 in real time according to the flow to select a corresponding pipeline to realize the fluid flow test.
The utility model relates to a design and test method of a range self-switching flowmeter, which comprises the following specific steps:
step one: determining pressure loss and flow measurement range index requirements
According to the corresponding functional relation of differential pressure and flow, the measuring range self-switching flowmeter realizes real-time detection of fluid flow in the whole measuring range through automatic switching of two flow measuring modules with different specifications and sizes. The flow detection ranges corresponding to the two flow measurement modules are different, so that the corresponding structural parameters of the pipeline, the throttle plate and the function hole distribution of the throttle plate are different. Firstly, confirming the pipeline pressure loss and the flow measurement range according to the application requirements.
Step two: calculating structural parameters of pipeline, throttle plate and function hole
Comprehensively considering the index requirement of the pressure loss and the flow range, dividing the flow range into Q 1 、Q 2 ，Q 1 Corresponds to the flow range of small measuring range, Q 2 Corresponding to a wide range of flow rates, the total flow rate Q= { Q 1 、Q 2 }
Equation (1) is a corresponding functional relationship between fluid flow and pressure difference:
β＝d/D (2)
wherein Q is volume flow, C is outflow coefficient, epsilon is expansion coefficient, D is aperture of throttle plate function hole, D is diameter of pipeline, beta is equivalent diameter ratio, deltap is pressure difference, and ρ is fluid density.
Known flow rate Q 1 And pressure loss, and calculating the pipe diameter D of the pipeline A by combining the pressure loss (1) and the pressure loss (2) 1 The structural parameters of the function holes of the throttle plate comprise the number n of the function holes 1 Pore diameter d 1 ；
Known flow rate Q 2 And pressure loss, and calculating the pipe diameter D of the pipeline B by combining the pressure loss (1) and the pressure loss (2) 2 The structural parameters of the function holes of the throttle plate comprise the number n of the function holes 2 Pore diameter d 2 ；
The function holes are distributed on the same or different circumferences of the throttle plate and can be adjusted according to the specific application requirements.
Step three: simulation analysis of correspondence between fluid flow and pressure difference of two pipelines
By adopting Solidworks modeling and then using Ansys software Fluent module simulation analysis, when fluid flows through two different flow measuring modules, corresponding pipeline internal throttling is realizedAnd judging whether the resolution of the MEMS differential pressure sensor is met according to the front-back pressure difference of the plate A and the throttle plate B and the pressure difference curve. If not, adjust pipe diameter D 1 Or D 2 Function aperture d 1 Or d 2 Until the index requirement is met.
Step four: range self-switching flowmeter test verification
And (3) completing the design of the flow measurement module A and the flow measurement module B according to the steps one to three, and then connecting the flow measurement module A and the flow measurement module B with the switching module to form a closed loop test system. When the flow rate Q of the fluid is less than or equal to Q 1 When the switching control program sends out instructions to enable the main pipeline to be communicated with the pipeline A through the motor control valve, fluid in the pipeline flows through the flow measuring module A, and when the fluid flow Q 1 ＜Q≤Q 2 When the closed-loop testing system is adopted, the accurate measurement of the fluid flow in the whole range can be realized.
Step five: method performance evaluation
The method is influenced by experimental environmental factors, the actual test result and the theoretical simulation analysis result may have differences, the environmental factors are comprehensively considered in combination, the theoretical model is corrected, the internal structural parameters of the flow measurement module A and the flow measurement module B are optimized, and the test precision of the flowmeter is improved on the basis of meeting the test requirements.
Claims (5)
1. The measuring range self-switching flowmeter is characterized by comprising a flow test module A, a flow test module B and a switching module; the flow test module A consists of a pipeline A and a throttle plate A, MEMS differential pressure sensor, and the flow test module B consists of a pipeline B and a throttle plate B, MEMS differential pressure sensor; a plurality of function holes are distributed on the throttle plate A and the throttle plate B respectively; the switching module comprises a motor, a valve and a control circuit, and the control circuit selects a corresponding pipeline according to the flow real-time switching valve to realize fluid flow test.
2. The self-switching range flowmeter of claim 1, wherein said conduits a and B are independent of each other, and wherein said conduits a and B are sized in time according to the range of the range.
3. A self-switching range flowmeter according to claim 1, wherein said throttle plate a is located inside pipe a; the throttle plate B is located inside the pipe B.
4. The self-switching range flowmeter of claim 1, wherein said MEMS differential pressure sensors are disposed at axial locations of throttle plate a and throttle plate B, respectively.
5. The self-switching range flowmeter of claim 1, wherein the function holes are distributed on the outer circumference centered on the MEMS differential pressure sensor, and the number of function holes is greater than or equal to 2 according to the application environment requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202223093675.4U CN218955833U (en) | 2022-11-21 | 2022-11-21 | Range self-switching flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223093675.4U CN218955833U (en) | 2022-11-21 | 2022-11-21 | Range self-switching flowmeter |
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| CN218955833U true CN218955833U (en) | 2023-05-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116576927A (en) * | 2023-05-10 | 2023-08-11 | 北京智芯传感科技有限公司 | Baffle self-switching flowmeter |
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- 2022-11-21 CN CN202223093675.4U patent/CN218955833U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116576927A (en) * | 2023-05-10 | 2023-08-11 | 北京智芯传感科技有限公司 | Baffle self-switching flowmeter |
| CN116576927B (en) * | 2023-05-10 | 2024-03-22 | 北京智芯传感科技有限公司 | Baffle self-switching flowmeter |
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